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CAM RIA ` .i <br /> Z <br /> T 1�� <br /> July 10, 1998 <br /> Mr. Ron Rowe <br /> Environmental-Health Division <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, 3"' Floor <br /> Stockton,California 95201-0388 <br /> Re: Investigation Work Plan Addendum #4 <br /> Shell-branded Service Station <br /> 341 Main Street <br /> Ripon, California <br /> WIC#204-6562-0804 <br /> Cambria Project#240-0342 <br /> SJCEHD Site Code: 506186 <br /> Dear Mr. Rowe: <br /> As :requested in your July 7, 1998 letter, Cambria Environmental Technology, Inc. (Cambria) is <br /> submitting this work plan addendum on behalf of Equilon Enterprises, LLC (Equilon) for a subsurface <br /> investigation at the site referenced above. This addendum covers work in addition to that outlined in <br /> [" Cambria's Investigation Work-Plan Addendum#3 dated June 30, 1998. <br /> The scope of this addendum includes additional reporting, a conduit survey, a well survey,procurement <br /> of access agreements with nearby property owners, additional analytical work, an analysis of historical <br /> ground water depth, a change in the proposed location of cone penetrometer testing (CPT) boring <br /> locations, tank and piping system inspection and tightness testing, and other issues. All work will be <br /> performed in a prompt and timely manner under the supervision of San Joaquin County Public Health <br /> Services.(SJCPHS) staff. A detailed description of each of these tasks follows: <br /> CAMBRIA Additional Reporting: Cambria will tabulate the historical ground water analytical data from the well <br /> installation and the quarterly monitoring events on a single table in chronological order. Subsequent <br /> ENVIRONMENTAL quarterly monitoring reports-will also include tabulated historical data. A site map will be included in <br /> TECHNOLOGY,INC. future quarterly monitoring reports that will include all detected hydrocarbons. A rose diagram of <br /> ground water gradient will be plotted on the ground water contour maps as.part of the quarterly <br /> 1144 65TH STREET, monitoring program after additional wells are installed to determine ground water flow direction. <br /> SUITE B <br /> OAKLAND, <br /> CA 94608 <br /> o)420-0700 <br /> FAx:(510)420-9170 <br /> I <br />